DNS report for zone abebooks.co.uk

This is a cached entry from 2012-01-12 16:49:21, press here to do a realtime lookup!

• Category Status Test Name Information
• NS
  • 
  • NS records from
    your nameservers

  • NS records got from your nameservers are:

    
    

    pdns3.ultradns.org [199.7.68.1]
    pdns2.ultradns.net [204.74.109.1]
    pdns1.ultradns.net [204.74.108.1]
    pdns5.ultradns.info [204.74.114.1]
    pdns6.ultradns.co.uk [204.74.115.1]
    pdns4.ultradns.org [199.7.69.1]
    

• • 
  • Zone transfers

  • All of your nameservers disallows zone transfers (AXFR). This is good.

• • 
  • Recursive Queries

  • All of your nameservers disallows recursive queries. This is good.

• • 
  • Mismatched NS records

  • OK. The NS records at all your nameservers are identical.

• • 
  • DNS servers responded

  • Good. All nameservers listed at the parent server responded.

• • 
  • Multiple Nameservers

  • OK. You have multiple nameservers. In most cases 2 are enough, however, RFC2182 section 5 states that you must have at least 3 nameservers, and no more than 7.

• • 
  • Nameservers are lame

  • OK. All the nameservers listed at the parent servers answer authoritatively for your domain.

• • 
  • Domain CNAMES

  • OK. RFC1912 2.4 and RFC2181 10.3 state that there should be no CNAMEs if an NS (or any other)
    record is present.

• • 
  • Different subnets

  • OK. Looks like you have nameservers on different subnets!

• • 
  • IPs of nameservers
    are public

  • Ok. Looks like the IP addresses of your nameservers are public. This is a good thing because it will prevent DNS delays and other problems like

• • 
  • DNS servers allow
    TCP connection

  • OK. Seems all your DNS servers allow TCP connections. This is a good thing and useful even if UDP connections are used by default.

• SOA
  • 
  • SOA record

  • The SOA record is:
    Primary nameserver: udns1.ultradns.net
    Hostmaster E-mail address: domains@abebooks.com
    Serial #: 2011112301
    Refresh: 10800
    Retry: 3600
    Expire:604800
    Default TTL: 3600

• • 
  • NSs have same SOA
    serial

  • OK. All your nameservers agree that your SOA serial number is 2011112301

• • 
  • SOA MNAME entry

  • WARN. udns1.ultradns.net is not listed in the zone as a nameserver. This could mean that you're leaking information about a hidden master.

• • 
  • SOA Serial

  • Your SOA serial number is: 2011112301. Your SOA serial can pretty much be whatever you want, but most people prefer to have it in YYYYMMDD00-99 format.

• • 
  • SOA REFRESH

  • OK. Your SOA REFRESH interval is: 10800. That is OK

• • 
  • SOA RETRY

  • OK. Your SOA RETRY value is: 600. Looks ok.

• • 
  • SOA EXPIRE

  • WARN. Your SOA EXPIRE interval is: 604800. We recommend that you raise it to be within the 1209600 to 2419200 range. (2 to 4 weeks)

• • 
  • SOA MINIMUM

  • OK. Your SOA MINIMUM value is: 3600. Looks ok.

• MX
  • 
  • MX Records

  • Your MX records that were reported by your nameservers are:

    
    

    0 exmail.abebooks.com
    

• • 
  • MX is not IP

  • OK. All of your MX records are host names.

• • 
  • Multiple MX

  • WARN. You have one MX-record. You should look into getting a backup mailserver for increased redundancy.